Give yourself something to look forward to. 

Set up a lunch for next week that makes you anticipate good things to come. People may be slow to reply since it's Friday afternoon, but in the worst case you'll come back Monday to some positive responses.

Make a list of your typical distractions, the habits and stressors that keep you from starting the workweek with a bang. 

Make a list and then write down what you will do instead. Create a new routine that's uplifting and energizing. Put it where you will see it first thing Monday...

Hide some small treat in your desk drawer or file cabinet - a chocolate bar or another little indulgence you like, to have something delightful to look forward to on your return. 

The best part is when you forget all about it and make a startling, pleasant discovery during the week. ...

Put on some inspiring music and spend a little time writing some thoughts about your current career and life.  Are you working toward your preferred future? Do you know how you want your future to look like? 

Make some notes and take them with you to consider over the weeke...